DisputeSoft presents the fourth in a series of articles authored by our colleague Andrew Schulman, who introduces readers to patent claims and the role of those claims in patent litigation. The articles are drawn from Andrew’s book, Claim Charts: Marshalling Facts in Patent Litigation, currently in preparation for publication, and are also available on Andrew’s website, softwarelitigationconsulting.com.

In this article, Andrew walks readers through a limitation-by limitation comparison of a facade-server patent claim with a hypothetical accused product to investigate possible infringement. To do this, Andrew illustrates several ways to structure comparisons of single claim limitations, including breaking down the limitation into subparts and utilizing the function/way/result test for equivalence.